Economies what meant wealth among the plains indians? how did they get it

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

How was the storming of the bastille important to the french revolutiona) it forced the king to accept the people's demands for justice. b) it marked the official beginning of the french revolution. c) it compelled the government to treat people with respect.d) it exposed the french soldier's lazy attitudes and weak skills.e) it symbolized the constitutional monarchy.

What are new social classes emerged due to advancement in agriculture ?